Microtwinning in Single-Crystal Nickel-Based Superalloys During Compressive Deformation at 1000 °C

Zhang, P.; Yuan, Yong; Li, J.; Liu, P.; Zuo-ning, Gao; Xiao-nan, Gong

doi:10.1007/s11661-022-06944-3

Cited by 2 publications

(2 citation statements)

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“…[4] Microstructural elements such as precipitated phases, grain size, and deformation microstructure significantly influence their properties. [5,6] A comprehensive understanding of the interplay between microstructures and mechanical properties is crucial for the accurate design and application of engineering materials. One effective approach involves developing a microstructural model to delve into the microscopic mechanisms governing plastic deformation.…”

Section: Introductionmentioning

confidence: 99%

“…[9][10][11] Additionally, microtwins (MTs) have been identified as occurring during tensile deformation by other researchers. [5,12] Wang et al [13] demonstrated that the plastic deformation mechanism of the NBSX superalloy at room temperature (RT) involves antiphase boundary dislocation pair shearing of the γ 0 phase. Zhang et al [14] studied the uniaxial tensile behavior of the CMSX-4 nickel-based superalloy and segmented the tensile process into three stages.…”

Section: Introductionmentioning

confidence: 99%

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Tensile Deformation Behaviors and Microstructure Evolution Under Various Temperatures for MAR‐M247 Nickel‐Based Superalloy

Jiang,

Zou,

Liu

et al. 2024

Adv Eng Mater

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The study aims to analyze the tensile behavior and microstructural changes in MAR‐M247 nickel‐based superalloy across different temperatures. Tensile behavior is examined under a constant strain rate of 2.5 × 10−4 s−1 at varying temperatures. Results indicate a temperature‐dependent nature of the alloy's tensile properties. At 550 °C, a Portevin–Le Chatelier effect is observed, attributed to twinning nucleation and carbon atom diffusion. Dynamic recrystallization occurs at 950 °C, manifesting in a sinusoidal stress–strain curve. At room temperature, the primary fracture mechanism involves dislocation shearing in the γ matrix, with minor dislocation shearing in the γ′ phase. At 550 °C, carbides along grain boundaries and the γ′ phase impede dislocation motion. Concurrently, dislocations shear the γ′ phase, leading to the formation of superlattice intrinsic stacking faults and Kear–Wilsdorf locks, thereby enhancing tensile strength. However, at 950 °C, dislocation motion primarily involves climb, carbides decompose, the γ′ phase softens and enlarges, resulting in a notable decrease in tensile strength.

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Section: Introductionmentioning

confidence: 99%